B 0— B¯0 mixing in the U(1) X SSM

Abstract

U(1) X SSM is a non-universal Abelian extension of the Minimal Supersymmetric Standard Model and its local gauge group is extended to SU(3) C × SU(2) L × U(1) Y × U(1) X . Based on the latest data of neutral meson mixing and experimental limitations, we investigate the process of B0−B0¯ mixing in U(1) X SSM. Using the effective Hamiltonian method, the Wilson coefficients and mass difference Δm B are derived. The abundant numerical results verify that vS,MD2,λC,μ,M2,tanβ,gYX,M1 and λ H are sensitive parameters to the process of B0−B0¯ mixing. With further measurement in the experiment, the parameter space of the U(1) X SSM will be further constrained during the mixing process of B0−B0¯ .